<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<div id="app">
    <h2>当前计数: {{counter}}</h2>
    <!--<button v-on:click="counter++">+</button>-->
    <!--<button v-on:click="counter--;">-</button>-->
    <button v-on:click="add">+</button>
    <button v-on:click="sub">-</button>
    <!--下面是语法糖写法-->
    <!--<button @click="sub">-</button>-->
</div>

<script src="../js/vue.js"></script>
<script>
    // 语法糖: 简写
    // proxy
    const obj = {
        counter: 0,
        message: 'abc'
    }

    new Vue()

    const app = new Vue({
        el: '#app',
        data: obj,
        methods: {
            add: function () {
                console.log('add被执行');
                this.counter++
            },
            sub: function () {
                console.log('sub被执行');
                this.counter--
            }
        },
        beforeCreate: function () {

        },
        created: function () {
            console.log('created');
        },
        mounted: function () {
            console.log('mounted');
        }
    })

    // 1.拿button元素

    // 2.添加监听事件
</script>

</body>
</html>